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A new synchrotron X–ray diffraction study of ε–FeOOH has been carried out to determine the pressure–volume– temperature (P–V–T ) equation of state (EOS). The P–V–T data fitted a third–order Birch–Murnaghan EOS yielded: isothermal bulk modulus KT0 of 135(3) GPa; its pressure derivative K′ of 6.1(9); (∂KT/∂T )P of −0.05(2) GPa K−1; a0 of 2.6(7) × 10−5 K−1 and a1 of 1.0(3) × 10−7 K−2, where the volumetric thermal expansion coefficient is described as α0,T = a0 + a1 × (T − 300).

Pressure–volume–temperature equation of state of ε–FeOOH to 11 GPa and 700 K